Pipe-bending machine.



G. H. REYNOLDS, DEGD.

A. E. REYNOLDS, ADHINISTRATBIX.

PIPE BENDING MACHINE. APPLICATION TILED APB..30,1907.

Patented Nov. 22, 1910.

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ATTORNEYS #WITVN ESSES Z /4/% M G. H. REYNOLDS, DEGDQ A. n. REYNOLDS, Anmnrg'ru'rmx.

PIPE BENDING MACHINE.

APPLICATION FILED $311.30, 1907.

Patehted Nov. 22,

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' WITNESSES:

G. H. REYNOLDS, DEGD.

A. n. nmmoms, ADMINISTRATRIX.

PIPE BENDING MACHINE.

APPLICATION IILED APB.30, 1907. 976,599. Patented Nov. 22, 1910.

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iNVENTOR ATTORN EY WITNESSES: JV Q 0%;

UNITED STATES PATENT OFFICE.

GEORGE H. REYNOLDS, OF MANSFIELD DEPOT, CONNECTICUT; ABBY E. REYNOLDS,

ADMINISTRATRIX OF SAID GEORGE H. REYNOLDS, DECEASED, ASSIGNOR TO GEN- ERAL FIRE EXTINGUISHER COMPANY, A CORPORATION OF NEW'YORK.

PIPE-BENDING MACHINE.

Patented Nov.

7 To all whom 'it may concern:

Be it known that I, GEORGE H. REYNOLDS,

a citizen of the United States, and a resident of Mansfield,Depot, in the county of Tolland and State of Connectlcut, United States of America, have invented certaln new and useful Improvements in Pipe-Bending Machines, of which the following is a specification.

My invention relates to new and useful improvements in pipe bending machines and it consists in the construction and arrangement of parts which I will describe in the following specification and the novel features whereof I will set forth in claims.

Referring to the drawings, Figure 1 is a side elevation of a pipe bending machine made according to my invention. Fig. 2 is a plan view of the same. Fig. 3 is a sectional plan view on an enlarged scale of some of the parts of which my machine .is constructed. Fig. 4 is a sectional end View of my machine, the section being taken through the line 4-4 of Fig. 1, and the view bein taken in the direction of the arrows. .F igs. 5 and 6 are similar end views, the sections being taken through the lines 5-5 and 6 6, respectively, of F 1g. 1. These Figs. 4, 5 and 6 are on a larger scale than used in Fig. 1 through which the sections are taken. Fig. 7 is an end elevation of my pipe bending machine showing a portion of a pipe as it appears during the process of being bent. Fig. 8 is a plan view of a portion of my machine and a pipe showing the relative positions of these parts while the pipe is being bent. Fig. 9 is a plan view of two portions of pipe illustrating some of the work which may be done upon pipe with myimproved apparatus.

Like characters of reference designate corresponding parts in all of the figures.

10 designates a foundation base or floor of concrete or other suitable material upon which the apparatus may be supported and to which it may be secured by means of foundation bolts 11.

12, 12 designate channel-ironsv placed upon the foundation, and these channel-irons form a frame upon which the various parts of the apparatus are mounted and by which they. are connected.

13 designates a tail-bracket which is attached to the channel-irons 12,12 and which may be secured to the floor by one of the foundationbolts 11. A hole is rovidedin the upper end of this tail-brac et for-the reception of a pipe 14, the end of which is threaded and is secured to the tail-bracket by means of nuts 15, 15. A mixin valve 16is screwed ,onto the back end of t e pipe 14. To the other end of this pipe a supporting plug 17 is attached, and burner holes 1? are provided in the end of the supporting pug.

' 20'des1gnates a cylinder of special construction which I will nowv describe. It

comprises a lining 21 preferably of brass or other non-corrosive metal and an outer shell 22 which may be of steel. or other suitable material.

23 designates the front cylinder head and 24 the back cylinder head. These cylinder heads may be castings constructed and arranged, as shown in Fig. 5, to be attached to the channel-irons 12 by bolts 25, and to the floor by the foundation bolts 11. Grooves are turned. in the inner surfaces of these cylinder heads, the inner diameter of which corresponds with the inner diameter of the lining 21 and the outer diameter of which corresponds with the outer diameter of the shell 22. These grooves serve to hold the lining 21 and the shell 22 in proper position with their axes in common. The annular space formed between the lining 21 and the shell 22 may be filled with a non-compres sible material 26 such, for example, as resin which may be poured into the space in a molten condition" and then allowed to harden. It is preferable, also, to have this filling material a non-conductor of heat.

Packing rings 27, 27 are placed at the bottom of the grooves of the c linder heads,

and the heads are securely hel together and made to force the lining and shell against the packing ring 27 by means of tie-bolts 28 and nuts 29.

A stuffing-box 30 of ordinary construction may be placed in the front cylinder head 25 and arranged to hold a packin 31 in the desired position. A similar stu ng-box 32 may be placed in the back cylinder head 24 and arranged to hold a" packing 3.3. in the desired position.

40 designates a hollow piston-rod, theouter end of whichis threaded and arranged to carry a cross-head 41 which may be screwed onto the threaded *portion of the piston-rod40. The forward end 42 of this cross-head is circular inform and of a diameter corresponding with that of the inside of a pipelwhich is to be acted upon by this apparatus. Thepiston-rod 40 is a'rranged to pass through the packing 31 and the front cylinder head 23 into the cylinder 20. The inner end of this piston-rod is also threaded and the -main portion 43 of a pistpn is securely attached thereto. This piston also comprises a secondary member 44 between which and the main vportion 43 a packing 45 of desired material and form may be laced. 6

46 deslgnates a tail-piece, the inner end of which is threaded into the inside of the main portion43 of the piston. This tail-piece is provided with a shoulder 47 which is adapted to engage with the secondary member 44 of the piston to force the latter forward toward the main portion of the piston over the'pipe 14.

and to thereby support and maintain the packing 45 in-compression. The rear end of the tail-piece 46 is arranged to pass through the back cylinder head and the packing 33 horizontally along them.

60 designates a base-plate which is'securely attached to the foundation or floor 10 by means of foundation bolts 11 and to the channel-irons 12. A forming sheave 61 is connected with this base-plate by means of a pivot 62. The outer periphery of the forming' sheave is constructed to form a semicircular groove 63 which is approximately of the diameter of the pipe operated upon by this apparatus' The radius of the wheel itself is approximately equal to the radius.

of the desired curve into which the:pipe is to be bent. p K V 64 designates a strap, the ends of which are arrangedto fit over the pivot 62 at either side of the hub of theforming sheave 61.

clamping dog 66.

A clampingscrew 65 is fitted into the end of this strap and arranged to coact with a Inverted T-grooves in the base-plate 60 radially disposed about the pivot 62. A supporting and guiding block 68 is'se'curely attached to the baseplate 60 by means of bolts 69.

, 70 designates a water. pipe from a suitable source of supply under pressure which leads to afour-way valve 71. This valve is arranged to be operated by a hand lever 72 80. A mixture of admitted through t e mixing valve 16 and vented from buckling by the gui 67, 67 are provided,

and is conndcted with the front end of cylinder 20 by a pipe 73 and with the back end of the cylinder by a pipe 74.

75 is an exhaust pipe connected with valve 71.

It may be seen that by this arrangement water may be admitted to the front end of the cylinder 20 and the rear end of cylinder 20 attle same time connected with the exhaust pipe 7 5,. or vice-versa.

8O designates a pipe to be acted upon by this apparatus.

In operating this device the pipe is slipped over the guiding supporting plug 17, which is slightly smaller in diameter than the inside of the pipe, and pushed back until one end abuts the shoulder of the cross-- head 41. The pipe will then be placed between the groove 63 of the forming sheave and a similar groove in the guiding block 68. The clamping dog 66 is then placed within the strap 64 and forced down against the pipe by means of the clamping screw 65 so that the pipe is thereby securely clamped to the forming sheave 61 at the point opposite the strap 64. The inner surface of the clamping dog is also grooved to fit the pipe as and air may then be the pipe 14 and this mixture may-be lighted at the openings 18 within the pipe 80. The portion of the pipe which surrounds the su porting plug 17 will thereby become heate Hydraulic pressure is then admitted to the rear end of cylinder 20 behind the piston and the latter is'forced forward. The pipe 80 is thus pushed forward through the piston-rod 40 and the cross-head 41. The pipe is clamped to the periphery of the forming sheave 61, as I have shown, by the clamping dog 66 and the screw 65. The pi e is reding b ock 68. 'As the pipe is pushed forward it has to conform to the radius of the forming sheave, and in that way becomes bent into the desired curve. After the .pipe has thus been moved a short distance, a guiding clamp such as 90 may be secured in one of the inverted T-grooves 67 in the base-plate and pushed up against the pipe 80 to prevent any buckling between the guiding block 68 and the point at which the pipe is clamped to the forming sheave. A plurality of T- grooves are'provided and as many of these guiding clamps may be used as is found to be necessary.

If it is desired to form more than one bend in a pipe this result may be obtained by performing the operation above described until the pipe has been given a bend in one direction of as great a length as may be desired, after which the clampin screw 65 may be loosened, the strap andclamping dog returned to their original position, the pipe rotated a desired amount and again the clamping dog and strap.

clamjieed The nding operation may then proceed again in the manner above described. In

be obthis way a variety of curves may f y-re er tained-in one pipe. For example,

ring to Fig. 9, it may be seen that the pipe and needs only such mechanical skill as oneversed in the art should possess to vary the curves and bends which may be made in the pipe by using this apparatus. different radii may be obtained by means of removing the formin sheave and inserting in its place one of di ercnt size. If a p1 e longer than the stroke of the piston withm' cylinder 20 is to be acted upon, the apparatus may be arranged to provide for the insertion of an intermediate follower between the cross-head 41 and the rear end of the pipe 80.

For acting upon pipes of different diameter it is necessary to change but few of the parts of this apparatus. For example, it is in most cases necessary only to chan e the V forming sheave 61, the supporting p ug 17 and the guiding block 68 in order to make this apparatus operative for pipes of diifer- .ent diameters.

'The process of bendinga pipe by this apparatus does not subject the heated portion of the pipe to any tensional strains. On the contrary, the bending of the pipe is accomplished entirely by the pressure applied to the end of the pipeby the hydraulic'cylinder and piston, and this has a tendency to compress rather than draw out the fibers of the pipe. The heating apparatus is efficient as it is arranged to apply heat directly to the a point where it is needed.

What I claim is. 1. In a pipe-bending machine, a rotatable forming sheave, means for clamping a pipe to said sheave, a hydraulic cylinder, a hollow piston within the cylinder, a hollow piston-rod and a hollow tail+piece connected with the piston, a stationary gas-pipe within the piston, piston-rod and tail-piece, said piston being arranged to move the pipe and I the sheave together to bend the pipe.

2. In a pipe-bending machine, a rotatable forming sheave, means for clamping a pipe to said sheave, a hydraulic cylinder, a hollow piston within the cylinder, a hollow piston-rod and a hollow tail-piece connected with the piston, a stationary member within the piston, piston-rod and tail-piece, and a supporting-plug upon the stationary Bends of member, said iston being arranged to .move the pipe and t e sheave together to bend the 1 e. p .In a ipe-bending machine, a rotatable forming s eave, means for clamping a pipe to said sheave, .a hydraulic cylinder, a hollow piston within the cylinder, a hollow piston-"rod and a hollow tail-piece connected with the piston, a stationary gas-pipe within the piston, piston-rod andtail-piece, a supporting-plug upon the gas-pipe, and a gas-burner on the supporting-plug, said pis- ,ton being arranged to move the pipe and the sheave together to bend the ipe.

4. In a pipe-bending mac ine, a frame, a rotatable forming sheave associatedtherewith, means for clampin a pipe to said sheave, a hydraulic cylin cr' comprising a lining, a shell and an intermediate noncompressible filler; cylinder-heads attached to the frame a circular groove in each of the cylinder-heads, said grooves being arranged to hold the cylinder, packing in said grooves, a plurality of tie-bolts arranged to hold the cylinder-heads and cylinder together, and a piston within the cylinder,

said piston being arranged to move the pipe and'the sheave together to bend the pipe.

5. In a pipe-bending machine, a frame, a rotatable forming sheave associated therewith, means for clamping a pipe to said sheave, a hydraulic cylinder comprising a lining, a shell and an intermediate noncompressible filler, cylinder-heads attached to the frame, a circular groove in each of the cylinder-heads, said grooves being arranged to hold the cylinder, acking in said grooves, a plurality of tie-b0 ts arranged to hold the cylinder-heads and cylinder together, a hollow piston within the cylinder, a hollow piston-rod and a hollow tail-piece connected with the piston, a stationary gaspipe within the piston, piston rod and tailpiece, said piston. being arranged to move the pipe and the sheave together to bend the pipe, a supporting-plug attached tothe gaspipe within the clamped pipe, and a gasburner on the end of the supporting-plug.

6. In a pipe-bending machine, a frame, a base-plate, a rotatable forming sheave, a pivot therefor affixed to said base-plate, the

ase-plate being constructed to form T- grooves-radially disposed about said pivot, a strap connected with the pivot, a clamp.- ing-dog carried by the strap, a screw in the strap arrangedto clamp a pipe between the sheave. and the clamping-dog, a stationary supporting-block attached to the base-plate, an adjustable guiding-clamp arranged to be held by said T-grooves, a hydraulic cylinder comprising a lining, a shell and an intermediate non-compressible filler, cylinder-heads attached to the frame and arranged to support said cylinder, a piston within thecylinder, said piston being arranged to move the pipe and the sheave together, and a gasburner within the pipe. 7 In a pipe-ben ing machine, a frame, a

base-plate, a rotatable forming sheave, a pivot therefor aflixed to said base-plate, the

ase-plate being construtted to form T- grooves radially disposed about said ivot,

, a strap connected with the pivot, a amping-dog carried by the strap a screw in the strap arranged to clamp a lpe between the sheave and the clamping- 0g, a stationary supporting-block attached to the base-plate, an adjustable guiding-clamp arranged tobe held in said T-grooves, a h draulic cylinder comprising a lining, a shel and an intermevalve arranged to control the movement of the piston, a supporting-plug within the pipe, a gas-burner in said supporting-plug,

and a mixing-valve associated with said gasburner.

8. In a pipe-bending machine, a frame, a base-plate, a rotatable forming sheave, a pivot therefor aflixed to said base-plate, the base-plate being constructed to form T- grooves radially dis osed about said ivot, a strap connected with the pivot, a 0 amping-dog carried by the strap, a screw in the strap "arranged to clamp a pipe within the sheave and the clamping-dog, a stationary supporting-block attached to the base-plate, an adjustable guiding-clamp arranged to be held in said T-grooves, a h draulic cylinder comprising a lining, a shel and an intermediate non-compressible filler, cylinder-heads attached to the frame, each of the cylinderheads being constructed to form a circular ro0ve,packin in said ooves, said grooves eing arrange tohol the c linder-heads in position on the cylinder, a ollow piston within the c linder, a hollow piston-rod and a hollow tail-piece connected with the piston, a stationary gas-pipe within the piston, piston-rod. and taillece, said piston being arranged to move t e p1pe an sheave together to bend the pipe, a supporting-plug attached to one end of the gas-pipe within the clamped pipe, a gas-burner on the end of the supporting-plug, and a mixing-valve on the other end of said gas-pipe.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE H. REYNOLDS.

Witnessesz ERNEST W. MARSHALL, ELLA TUcH. 

